男，45岁，心悸、气短、胸闷2年。心脏检查心尖区抬举性搏动，同时有颈动脉搏动增强，水冲脉、动脉枪击音等周围血管征。

周围血管征产生的原因最可能是（）

A.主动脉粥样硬化

B.高血压病

C.主动脉瓣关闭不全

D.甲状腺功能亢进

E.严重贫血

The operating cord on an inflatable liferaft should be renewed by（）.

A.removing the top half of the shell，cutting the line at its source，and renewing completely

B.cutting the line where it enters the case and replacing that portion

C.leaving the original line and tying another one to it so the two lines will take the strain

D.an approved servicing facility ashore